Mouthguard film liner



FIG. 1 is a front perspective view a mouthguard film liner showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a back view thereof;

FIG. 6 shows a side view of the invention surrounding a user's teeth;

FIG. 7 shows another perspective view of the invention inside a mouthguard; and,

FIG. 8 shows a top view of the invention inside a mouthguard.

Dashed lines in FIGS. 6-8 are used to show the user's teeth and the mouthguard which are environment and form no part of the claimed design. 

CLAIM I claim the ornamental design for a mouthguard film liner, as shown and described. 